an word with adjective, verb, and noun forms used to describe any activity in which an undersexed overhorny person (usually pubescent and male) lies, stoops, oggles, or performs any other number of usually shameful and tacky acts shamelessly on the premise that it's okay if it leads to sex.
(adj.) when he pretended his mom died of cancer so she'd sleep over, that was pretty macchi. (verb) please don't let me drink tonight guys, i'm afraid if i get drunk i'm going to macchi the first fat chick i see. (noun) it was a total macchi when you shouted out the wrong girl's name in bed and then kept shouting out wrong names so she'd think you were joking.